<?php
/*=======================================================================
 // File:        JPGRAPH_PIE3D.PHP
 // Description: 3D Pie plot extension for JpGraph
 // Created:     2001-03-24
 // Ver:         $Id: jpgraph_pie3d.php 1329 2009-06-20 19:23:30Z ljp $
 //
 // Copyright (c) Aditus Consulting. All rights reserved.
 //========================================================================
 */

//===================================================
// CLASS PiePlot3D
// Description: Plots a 3D pie with a specified projection
// angle between 20 and 70 degrees.
//===================================================
class PiePlot3D extends PiePlot {
	private $labelhintcolor="red",$showlabelhint=true;
	private $angle=50;
	private $edgecolor="", $edgeweight=1;
	private $iThickness=false;

	//---------------
	// CONSTRUCTOR
	function __construct($data) {
		$this->radius = 0.5;
		$this->data = $data;
		$this->title = new Text("");
		$this->title->SetFont(FF_FONT1,FS_BOLD);
		$this->value = new DisplayValue();
		$this->value->Show();
		$this->value->SetFormat('%.0f%%');
	}

	//---------------
	// PUBLIC METHODS

	// Set label arrays
	function SetLegends($aLegend) {
		$this->legends = array_reverse(array_slice($aLegend,0,count($this->data)));
	}

	function SetSliceColors($aColors) {
		$this->setslicecolors = $aColors;
	}

	function Legend($aGraph) {
		parent::Legend($aGraph);
		$aGraph->legend->txtcol = array_reverse($aGraph->legend->txtcol);
	}

	function SetCSIMTargets($aTargets,$aAlts='',$aWinTargets='') {
		$this->csimtargets = $aTargets;
		$this->csimwintargets = $aWinTargets;
		$this->csimalts = $aAlts;
	}

	// Should the slices be separated by a line? If color is specified as "" no line
	// will be used to separate pie slices.
	function SetEdge($aColor='black',$aWeight=1) {
		$this->edgecolor = $aColor;
		$this->edgeweight = $aWeight;
	}

	// Specify projection angle for 3D in degrees
	// Must be between 20 and 70 degrees
	function SetAngle($a) {
		if( $a<5 || $a>90 ) {
			JpGraphError::RaiseL(14002);
			//("PiePlot3D::SetAngle() 3D Pie projection angle must be between 5 and 85 degrees.");
		}
		else {
			$this->angle = $a;
		}
	}

	function Add3DSliceToCSIM($i,$xc,$yc,$height,$width,$thick,$sa,$ea) {  //Slice number, ellipse centre (x,y), height, width, start angle, end angle

		$sa *= M_PI/180;
		$ea *= M_PI/180;

		//add coordinates of the centre to the map
		$coords = "$xc, $yc";

		//add coordinates of the first point on the arc to the map
		$xp = floor($width*cos($sa)/2+$xc);
		$yp = floor($yc-$height*sin($sa)/2);
		$coords.= ", $xp, $yp";

		//If on the front half, add the thickness offset
		if ($sa >= M_PI && $sa <= 2*M_PI*1.01) {
			$yp = floor($yp+$thick);
			$coords.= ", $xp, $yp";
		}

		//add coordinates every 0.2 radians
		$a=$sa+0.2;
		while ($a<$ea) {
			$xp = floor($width*cos($a)/2+$xc);
			if ($a >= M_PI && $a <= 2*M_PI*1.01) {
				$yp = floor($yc-($height*sin($a)/2)+$thick);
			} else {
				$yp = floor($yc-$height*sin($a)/2);
			}
			$coords.= ", $xp, $yp";
			$a += 0.2;
		}

		//Add the last point on the arc
		$xp = floor($width*cos($ea)/2+$xc);
		$yp = floor($yc-$height*sin($ea)/2);


		if ($ea >= M_PI && $ea <= 2*M_PI*1.01) {
			$coords.= ", $xp, ".floor($yp+$thick);
		}
		$coords.= ", $xp, $yp";
		$alt='';

		if( !empty($this->csimtargets[$i]) ) {
			$this->csimareas .= "<area shape=\"poly\" coords=\"$coords\" href=\"".$this->csimtargets[$i]."\"";

			if( !empty($this->csimwintargets[$i]) ) {
				$this->csimareas .= " target=\"".$this->csimwintargets[$i]."\" ";
			}
			 
			if( !empty($this->csimalts[$i]) ) {
				$tmp=sprintf($this->csimalts[$i],$this->data[$i]);
				$this->csimareas .= "alt=\"$tmp\" title=\"$tmp\" ";
			}
			$this->csimareas .=  " />\n";
		}

	}

	function SetLabels($aLabels,$aLblPosAdj="auto") {
		$this->labels = $aLabels;
		$this->ilabelposadj=$aLblPosAdj;
	}


	// Distance from the pie to the labels
	function SetLabelMargin($m) {
		$this->value->SetMargin($m);
	}

	// Show a thin line from the pie to the label for a specific slice
	function ShowLabelHint($f=true) {
		$this->showlabelhint=$f;
	}

	// Set color of hint line to label for each slice
	function SetLabelHintColor($c) {
		$this->labelhintcolor=$c;
	}

	function SetHeight($aHeight) {
		$this->iThickness = $aHeight;
	}


	// Normalize Angle between 0-360
	function NormAngle($a) {
		// Normalize anle to 0 to 2M_PI
		//
		if( $a > 0 ) {
			while($a > 360) $a -= 360;
		}
		else {
			while($a < 0) $a += 360;
		}
		if( $a < 0 )
		$a = 360 + $a;

		if( $a == 360 ) $a=0;
		return $a;
	}



	// Draw one 3D pie slice at position ($xc,$yc) with height $z
	function Pie3DSlice($img,$xc,$yc,$w,$h,$sa,$ea,$z,$fillcolor,$shadow=0.65) {

		// Due to the way the 3D Pie algorithm works we are
		// guaranteed that any slice we get into this method
		// belongs to either the left or right side of the
		// pie ellipse. Hence, no slice will cross 90 or 270
		// point.
		if( ($sa < 90 && $ea > 90) || ( ($sa > 90 && $sa < 270) && $ea > 270) ) {
			JpGraphError::RaiseL(14003);//('Internal assertion failed. Pie3D::Pie3DSlice');
			exit(1);
		}

		$p[] = array();

		// Setup pre-calculated values
		$rsa = $sa/180*M_PI; // to Rad
		$rea = $ea/180*M_PI; // to Rad
		$sinsa = sin($rsa);
		$cossa = cos($rsa);
		$sinea = sin($rea);
		$cosea = cos($rea);

		// p[] is the points for the overall slice and
		// pt[] is the points for the top pie

		// Angular step when approximating the arc with a polygon train.
		$step = 0.05;

		if( $sa >= 270 ) {
			if( $ea > 360 || ($ea > 0 && $ea <= 90) ) {
				if( $ea > 0 && $ea <= 90 ) {
					// Adjust angle to simplify conditions in loops
					$rea += 2*M_PI;
				}

				$p = array($xc,$yc,$xc,$yc+$z,
				$xc+$w*$cossa,$z+$yc-$h*$sinsa);
				$pt = array($xc,$yc,$xc+$w*$cossa,$yc-$h*$sinsa);

				for( $a=$rsa; $a < 2*M_PI; $a += $step ) {
					$tca = cos($a);
					$tsa = sin($a);
					$p[] = $xc+$w*$tca;
					$p[] = $z+$yc-$h*$tsa;
					$pt[] = $xc+$w*$tca;
					$pt[] = $yc-$h*$tsa;
				}

				$pt[] = $xc+$w;
				$pt[] = $yc;

				$p[] = $xc+$w;
				$p[] = $z+$yc;
				$p[] = $xc+$w;
				$p[] = $yc;
				$p[] = $xc;
				$p[] = $yc;

				for( $a=2*M_PI+$step; $a < $rea; $a += $step ) {
					$pt[] = $xc + $w*cos($a);
					$pt[] = $yc - $h*sin($a);
				}

				$pt[] = $xc+$w*$cosea;
				$pt[] = $yc-$h*$sinea;
				$pt[] = $xc;
				$pt[] = $yc;

			}
			else {
				$p = array($xc,$yc,$xc,$yc+$z,
				$xc+$w*$cossa,$z+$yc-$h*$sinsa);
				$pt = array($xc,$yc,$xc+$w*$cossa,$yc-$h*$sinsa);

				$rea = $rea == 0.0 ? 2*M_PI : $rea;
				for( $a=$rsa; $a < $rea; $a += $step ) {
					$tca = cos($a);
					$tsa = sin($a);
					$p[] = $xc+$w*$tca;
					$p[] = $z+$yc-$h*$tsa;
					$pt[] = $xc+$w*$tca;
					$pt[] = $yc-$h*$tsa;
				}

				$pt[] = $xc+$w*$cosea;
				$pt[] = $yc-$h*$sinea;
				$pt[] = $xc;
				$pt[] = $yc;

				$p[] = $xc+$w*$cosea;
				$p[] = $z+$yc-$h*$sinea;
				$p[] = $xc+$w*$cosea;
				$p[] = $yc-$h*$sinea;
				$p[] = $xc;
				$p[] = $yc;
			}
		}
		elseif( $sa >= 180 ) {
			$p = array($xc,$yc,$xc,$yc+$z,$xc+$w*$cosea,$z+$yc-$h*$sinea);
			$pt = array($xc,$yc,$xc+$w*$cosea,$yc-$h*$sinea);

			for( $a=$rea; $a>$rsa; $a -= $step ) {
				$tca = cos($a);
				$tsa = sin($a);
				$p[] = $xc+$w*$tca;
				$p[] = $z+$yc-$h*$tsa;
				$pt[] = $xc+$w*$tca;
				$pt[] = $yc-$h*$tsa;
			}

			$pt[] = $xc+$w*$cossa;
			$pt[] = $yc-$h*$sinsa;
			$pt[] = $xc;
			$pt[] = $yc;

			$p[] = $xc+$w*$cossa;
			$p[] = $z+$yc-$h*$sinsa;
			$p[] = $xc+$w*$cossa;
			$p[] = $yc-$h*$sinsa;
			$p[] = $xc;
			$p[] = $yc;

		}
		elseif( $sa >= 90 ) {
			if( $ea > 180 ) {
				$p = array($xc,$yc,$xc,$yc+$z,$xc+$w*$cosea,$z+$yc-$h*$sinea);
				$pt = array($xc,$yc,$xc+$w*$cosea,$yc-$h*$sinea);

				for( $a=$rea; $a > M_PI; $a -= $step ) {
					$tca = cos($a);
					$tsa = sin($a);
					$p[] = $xc+$w*$tca;
					$p[] = $z + $yc - $h*$tsa;
					$pt[] = $xc+$w*$tca;
					$pt[] = $yc-$h*$tsa;
				}

				$p[] = $xc-$w;
				$p[] = $z+$yc;
				$p[] = $xc-$w;
				$p[] = $yc;
				$p[] = $xc;
				$p[] = $yc;

				$pt[] = $xc-$w;
				$pt[] = $z+$yc;
				$pt[] = $xc-$w;
				$pt[] = $yc;

				for( $a=M_PI-$step; $a > $rsa; $a -= $step ) {
					$pt[] = $xc + $w*cos($a);
					$pt[] = $yc - $h*sin($a);
				}

				$pt[] = $xc+$w*$cossa;
				$pt[] = $yc-$h*$sinsa;
				$pt[] = $xc;
				$pt[] = $yc;

			}
			else { // $sa >= 90 && $ea <= 180
				$p = array($xc,$yc,$xc,$yc+$z,
				$xc+$w*$cosea,$z+$yc-$h*$sinea,
				$xc+$w*$cosea,$yc-$h*$sinea,
				$xc,$yc);

				$pt = array($xc,$yc,$xc+$w*$cosea,$yc-$h*$sinea);

				for( $a=$rea; $a>$rsa; $a -= $step ) {
					$pt[] = $xc + $w*cos($a);
					$pt[] = $yc - $h*sin($a);
				}

				$pt[] = $xc+$w*$cossa;
				$pt[] = $yc-$h*$sinsa;
				$pt[] = $xc;
				$pt[] = $yc;

			}
		}
		else { // sa > 0 && ea < 90

			$p = array($xc,$yc,$xc,$yc+$z,
			$xc+$w*$cossa,$z+$yc-$h*$sinsa,
			$xc+$w*$cossa,$yc-$h*$sinsa,
			$xc,$yc);

			$pt = array($xc,$yc,$xc+$w*$cossa,$yc-$h*$sinsa);

			for( $a=$rsa; $a < $rea; $a += $step ) {
				$pt[] = $xc + $w*cos($a);
				$pt[] = $yc - $h*sin($a);
			}

			$pt[] = $xc+$w*$cosea;
			$pt[] = $yc-$h*$sinea;
			$pt[] = $xc;
			$pt[] = $yc;
		}
		 
		$img->PushColor($fillcolor.":".$shadow);
		$img->FilledPolygon($p);
		$img->PopColor();

		$img->PushColor($fillcolor);
		$img->FilledPolygon($pt);
		$img->PopColor();
	}

	function SetStartAngle($aStart) {
		if( $aStart < 0 || $aStart > 360 ) {
			JpGraphError::RaiseL(14004);//('Slice start angle must be between 0 and 360 degrees.');
		}
		$this->startangle = $aStart;
	}

	// Draw a 3D Pie
	function Pie3D($aaoption,$img,$data,$colors,$xc,$yc,$d,$angle,$z,
	$shadow=0.65,$startangle=0,$edgecolor="",$edgeweight=1) {

		//---------------------------------------------------------------------------
		// As usual the algorithm get more complicated than I originally
		// envisioned. I believe that this is as simple as it is possible
		// to do it with the features I want. It's a good exercise to start
		// thinking on how to do this to convince your self that all this
		// is really needed for the general case.
		//
		// The algorithm two draw 3D pies without "real 3D" is done in
		// two steps.
		// First imagine the pie cut in half through a thought line between
		// 12'a clock and 6'a clock. It now easy to imagine that we can plot
		// the individual slices for each half by starting with the topmost
		// pie slice and continue down to 6'a clock.
		//
		// In the algortithm this is done in three principal steps
		// Step 1. Do the knife cut to ensure by splitting slices that extends
		// over the cut line. This is done by splitting the original slices into
		// upto 3 subslices.
		// Step 2. Find the top slice for each half
		// Step 3. Draw the slices from top to bottom
		//
		// The thing that slightly complicates this scheme with all the
		// angle comparisons below is that we can have an arbitrary start
		// angle so we must take into account the different equivalence classes.
		// For the same reason we must walk through the angle array in a
		// modulo fashion.
		//
		// Limitations of algorithm:
		// * A small exploded slice which crosses the 270 degree point
		//   will get slightly nagged close to the center due to the fact that
		//   we print the slices in Z-order and that the slice left part
		//   get printed first and might get slightly nagged by a larger
		//   slice on the right side just before the right part of the small
		//   slice. Not a major problem though.
		//---------------------------------------------------------------------------


		// Determine the height of the ellippse which gives an
		// indication of the inclination angle
		$h = ($angle/90.0)*$d;
		$sum = 0;
		for($i=0; $i<count($data); ++$i ) {
			$sum += $data[$i];
		}

		// Special optimization
		if( $sum==0 ) return;

		if( $this->labeltype == 2 ) {
			$this->adjusted_data = $this->AdjPercentage($data);
		}

		// Setup the start
		$accsum = 0;
		$a = $startangle;
		$a = $this->NormAngle($a);

		//
		// Step 1 . Split all slices that crosses 90 or 270
		//
		$idx=0;
		$adjexplode=array();
		$numcolors = count($colors);
		for($i=0; $i<count($data); ++$i, ++$idx ) {
			$da = $data[$i]/$sum * 360;

			if( empty($this->explode_radius[$i]) ) {
				$this->explode_radius[$i]=0;
			}

			$expscale=1;
			if( $aaoption == 1 ) {
				$expscale=2;
			}

			$la = $a + $da/2;
			$explode = array( $xc + $this->explode_radius[$i]*cos($la*M_PI/180)*$expscale,
			$yc - $this->explode_radius[$i]*sin($la*M_PI/180) * ($h/$d) *$expscale );
			$adjexplode[$idx] = $explode;
			$labeldata[$i] = array($la,$explode[0],$explode[1]);
			$originalangles[$i] = array($a,$a+$da);

			$ne = $this->NormAngle($a+$da);
			if( $da <= 180 ) {
				// If the slice size is <= 90 it can at maximum cut across
				// one boundary (either 90 or 270) where it needs to be split
				$split=-1; // no split
				if( ($da<=90 && ($a <= 90 && $ne > 90)) ||
				(($da <= 180 && $da >90)  && (($a < 90 || $a >= 270) && $ne > 90)) ) {
					$split = 90;
				}
				elseif( ($da<=90 && ($a <= 270 && $ne > 270)) ||
				(($da<=180 && $da>90) && ($a >= 90 && $a < 270 && ($a+$da) > 270 )) ) {
					$split = 270;
				}
				if( $split > 0 ) { // split in two
					$angles[$idx] = array($a,$split);
					$adjcolors[$idx] = $colors[$i % $numcolors];
					$adjexplode[$idx] = $explode;
					$angles[++$idx] = array($split,$ne);
					$adjcolors[$idx] = $colors[$i % $numcolors];
					$adjexplode[$idx] = $explode;
				}
				else { // no split
					$angles[$idx] = array($a,$ne);
					$adjcolors[$idx] = $colors[$i  % $numcolors];
					$adjexplode[$idx] = $explode;
				}
			}
			else {
				// da>180
				// Slice may, depending on position, cross one or two
				// bonudaries

				if( $a < 90 )        $split = 90;
				elseif( $a <= 270 )  $split = 270;
				else                 $split = 90;

				$angles[$idx] = array($a,$split);
				$adjcolors[$idx] = $colors[$i % $numcolors];
				$adjexplode[$idx] = $explode;
				//if( $a+$da > 360-$split ) {
				// For slices larger than 270 degrees we might cross
				// another boundary as well. This means that we must
				// split the slice further. The comparison gets a little
				// bit complicated since we must take into accound that
				// a pie might have a startangle >0 and hence a slice might
				// wrap around the 0 angle.
				// Three cases:
				//  a) Slice starts before 90 and hence gets a split=90, but
				//     we must also check if we need to split at 270
				//  b) Slice starts after 90 but before 270 and slices
				//     crosses 90 (after a wrap around of 0)
				//  c) If start is > 270 (hence the firstr split is at 90)
				//     and the slice is so large that it goes all the way
				//     around 270.
				if( ($a < 90 && ($a+$da > 270)) || ($a > 90 && $a<=270 && ($a+$da>360+90) ) || ($a > 270 && $this->NormAngle($a+$da)>270) ) {
					$angles[++$idx] = array($split,360-$split);
					$adjcolors[$idx] = $colors[$i % $numcolors];
					$adjexplode[$idx] = $explode;
					$angles[++$idx] = array(360-$split,$ne);
					$adjcolors[$idx] = $colors[$i % $numcolors];
					$adjexplode[$idx] = $explode;
				}
				else {
					// Just a simple split to the previous decided
					// angle.
					$angles[++$idx] = array($split,$ne);
					$adjcolors[$idx] = $colors[$i % $numcolors];
					$adjexplode[$idx] = $explode;
				}
			}
			$a += $da;
			$a = $this->NormAngle($a);
		}

		// Total number of slices
		$n = count($angles);

		for($i=0; $i<$n; ++$i) {
			list($dbgs,$dbge) = $angles[$i];
		}

		//
		// Step 2. Find start index (first pie that starts in upper left quadrant)
		//
		$minval = $angles[0][0];
		$min = 0;
		for( $i=0; $i<$n; ++$i ) {
			if( $angles[$i][0] < $minval ) {
				$minval = $angles[$i][0];
				$min = $i;
			}
		}
		$j = $min;
		$cnt = 0;
		while( $angles[$j][1] <= 90 ) {
			$j++;
			if( $j>=$n) {
				$j=0;
			}
			if( $cnt > $n ) {
				JpGraphError::RaiseL(14005);
				//("Pie3D Internal error (#1). Trying to wrap twice when looking for start index");
			}
			++$cnt;
		}
		$start = $j;

		//
		// Step 3. Print slices in z-order
		//
		$cnt = 0;

		// First stroke all the slices between 90 and 270 (left half circle)
		// counterclockwise
		 
		while( $angles[$j][0] < 270  && $aaoption !== 2 ) {

			list($x,$y) = $adjexplode[$j];

			$this->Pie3DSlice($img,$x,$y,$d,$h,$angles[$j][0],$angles[$j][1],
			$z,$adjcolors[$j],$shadow);

			$last = array($x,$y,$j);

			$j++;
			if( $j >= $n ) $j=0;
			if( $cnt > $n ) {
				JpGraphError::RaiseL(14006);
				//("Pie3D Internal Error: Z-Sorting algorithm for 3D Pies is not working properly (2). Trying to wrap twice while stroking.");
			}
			++$cnt;
		}
		 
		$slice_left = $n-$cnt;
		$j=$start-1;
		if($j<0) $j=$n-1;
		$cnt = 0;

		// The stroke all slices from 90 to -90 (right half circle)
		// clockwise
		while( $cnt < $slice_left  && $aaoption !== 2 ) {

			list($x,$y) = $adjexplode[$j];

			$this->Pie3DSlice($img,$x,$y,$d,$h,$angles[$j][0],$angles[$j][1],
			$z,$adjcolors[$j],$shadow);
			$j--;
			if( $cnt > $n ) {
				JpGraphError::RaiseL(14006);
				//("Pie3D Internal Error: Z-Sorting algorithm for 3D Pies is not working properly (2). Trying to wrap twice while stroking.");
			}
			if($j<0) $j=$n-1;
			$cnt++;
		}

		// Now do a special thing. Stroke the last slice on the left
		// halfcircle one more time.  This is needed in the case where
		// the slice close to 270 have been exploded. In that case the
		// part of the slice close to the center of the pie might be
		// slightly nagged.
		if( $aaoption !== 2 )
		$this->Pie3DSlice($img,$last[0],$last[1],$d,$h,$angles[$last[2]][0],
		$angles[$last[2]][1],$z,$adjcolors[$last[2]],$shadow);


		if( $aaoption !== 1 ) {
			// Now print possible labels and add csim
			$this->value->ApplyFont($img);
			$margin = $img->GetFontHeight()/2 + $this->value->margin ;
			for($i=0; $i < count($data); ++$i ) {
				$la = $labeldata[$i][0];
				$x = $labeldata[$i][1] + cos($la*M_PI/180)*($d+$margin)*$this->ilabelposadj;
				$y = $labeldata[$i][2] - sin($la*M_PI/180)*($h+$margin)*$this->ilabelposadj;
				if( $this->ilabelposadj >= 1.0 ) {
					if( $la > 180 && $la < 360 ) $y += $z;
				}
				if( $this->labeltype == 0 ) {
					if( $sum > 0 ) $l = 100*$data[$i]/$sum;
					else $l = 0;
				}
				elseif( $this->labeltype == 1 ) {
					$l = $data[$i];
				}
				else {
					$l = $this->adjusted_data[$i];
				}
				if( isset($this->labels[$i]) && is_string($this->labels[$i]) ) {
					$l=sprintf($this->labels[$i],$l);
				}

				$this->StrokeLabels($l,$img,$labeldata[$i][0]*M_PI/180,$x,$y,$z);
				 
				$this->Add3DSliceToCSIM($i,$labeldata[$i][1],$labeldata[$i][2],$h*2,$d*2,$z,
				$originalangles[$i][0],$originalangles[$i][1]);
			}
		}

		//
		// Finally add potential lines in pie
		//

		if( $edgecolor=="" || $aaoption !== 0 ) return;

		$accsum = 0;
		$a = $startangle;
		$a = $this->NormAngle($a);

		$a *= M_PI/180.0;

		$idx=0;
		$img->PushColor($edgecolor);
		$img->SetLineWeight($edgeweight);

		$fulledge = true;
		for($i=0; $i < count($data) && $fulledge; ++$i ) {
			if( empty($this->explode_radius[$i]) ) {
				$this->explode_radius[$i]=0;
			}
			if( $this->explode_radius[$i] > 0 ) {
				$fulledge = false;
			}
		}
		 

		for($i=0; $i < count($data); ++$i, ++$idx ) {

			$da = $data[$i]/$sum * 2*M_PI;
			$this->StrokeFullSliceFrame($img,$xc,$yc,$a,$a+$da,$d,$h,$z,$edgecolor,
			$this->explode_radius[$i],$fulledge);
			$a += $da;
		}
		$img->PopColor();
	}

	function StrokeFullSliceFrame($img,$xc,$yc,$sa,$ea,$w,$h,$z,$edgecolor,$exploderadius,$fulledge) {
		$step = 0.02;

		if( $exploderadius > 0 ) {
			$la = ($sa+$ea)/2;
			$xc += $exploderadius*cos($la);
			$yc -= $exploderadius*sin($la) * ($h/$w) ;
			 
		}

		$p = array($xc,$yc,$xc+$w*cos($sa),$yc-$h*sin($sa));

		for($a=$sa; $a < $ea; $a += $step ) {
			$p[] = $xc + $w*cos($a);
			$p[] = $yc - $h*sin($a);
		}

		$p[] = $xc+$w*cos($ea);
		$p[] = $yc-$h*sin($ea);
		$p[] = $xc;
		$p[] = $yc;

		$img->SetColor($edgecolor);
		$img->Polygon($p);

		// Unfortunately we can't really draw the full edge around the whole of
		// of the slice if any of the slices are exploded. The reason is that
		// this algorithm is to simply. There are cases where the edges will
		// "overwrite" other slices when they have been exploded.
		// Doing the full, proper 3D hidden lines stiff is actually quite
		// tricky. So for exploded pies we only draw the top edge. Not perfect
		// but the "real" solution is much more complicated.
		if( $fulledge && !( $sa > 0 && $sa < M_PI && $ea < M_PI) ) {

			if($sa < M_PI && $ea > M_PI) {
				$sa = M_PI;
			}

			if($sa < 2*M_PI && (($ea >= 2*M_PI) || ($ea > 0 && $ea < $sa ) ) ) {
				$ea = 2*M_PI;
			}

			if( $sa >= M_PI && $ea <= 2*M_PI ) {
				$p = array($xc + $w*cos($sa),$yc - $h*sin($sa),
				$xc + $w*cos($sa),$z + $yc - $h*sin($sa));

				for($a=$sa+$step; $a < $ea; $a += $step ) {
					$p[] = $xc + $w*cos($a);
					$p[] = $z + $yc - $h*sin($a);
				}
				$p[] = $xc + $w*cos($ea);
				$p[] = $z + $yc - $h*sin($ea);
				$p[] = $xc + $w*cos($ea);
				$p[] = $yc - $h*sin($ea);
				$img->SetColor($edgecolor);
				$img->Polygon($p);
			}
		}
	}

	function Stroke($img,$aaoption=0) {
		$n = count($this->data);

		// If user hasn't set the colors use the theme array
		if( $this->setslicecolors==null ) {
			$colors = array_keys($img->rgb->rgb_table);
			sort($colors);
			$idx_a=$this->themearr[$this->theme];
			$ca = array();
			$m = count($idx_a);
			for($i=0; $i < $m; ++$i) {
				$ca[$i] = $colors[$idx_a[$i]];
			}
			$ca = array_reverse(array_slice($ca,0,$n));
		}
		else {
			$ca = $this->setslicecolors;
		}


		if( $this->posx <= 1 && $this->posx > 0 ) {
			$xc = round($this->posx*$img->width);
		}
		else {
			$xc = $this->posx ;
		}

		if( $this->posy <= 1 && $this->posy > 0 ) {
			$yc = round($this->posy*$img->height);
		}
		else {
			$yc = $this->posy ;
		}

		if( $this->radius <= 1 ) {
			$width = floor($this->radius*min($img->width,$img->height));
			// Make sure that the pie doesn't overflow the image border
			// The 0.9 factor is simply an extra margin to leave some space
			// between the pie an the border of the image.
			$width = min($width,min($xc*0.9,($yc*90/$this->angle-$width/4)*0.9));
		}
		else {
			$width = $this->radius * ($aaoption === 1 ? 2 : 1 ) ;
		}

		// Add a sanity check for width
		if( $width < 1 ) {
			JpGraphError::RaiseL(14007);//("Width for 3D Pie is 0. Specify a size > 0");
		}

		// Establish a thickness. By default the thickness is a fifth of the
		// pie slice width (=pie radius) but since the perspective depends
		// on the inclination angle we use some heuristics to make the edge
		// slightly thicker the less the angle.

		// Has user specified an absolute thickness? In that case use
		// that instead

		if( $this->iThickness ) {
			$thick = $this->iThickness;
			$thick *= ($aaoption === 1 ? 2 : 1 );
		}
		else {
			$thick = $width/12;
		}
		$a = $this->angle;

		if( $a <= 30 ) $thick *= 1.6;
		elseif( $a <= 40 ) $thick *= 1.4;
		elseif( $a <= 50 ) $thick *= 1.2;
		elseif( $a <= 60 ) $thick *= 1.0;
		elseif( $a <= 70 ) $thick *= 0.8;
		elseif( $a <= 80 ) $thick *= 0.7;
		else $thick *= 0.6;

		$thick = floor($thick);

		if( $this->explode_all ) {
			for($i=0; $i < $n; ++$i)
			$this->explode_radius[$i]=$this->explode_r;
		}

		$this->Pie3D($aaoption,$img,$this->data, $ca, $xc, $yc, $width, $this->angle,
		$thick, 0.65, $this->startangle, $this->edgecolor, $this->edgeweight);

		// Adjust title position
		if( $aaoption != 1 ) {
			$this->title->SetPos($xc,$yc-$this->title->GetFontHeight($img)-$width/2-$this->title->margin,         "center","bottom");
			$this->title->Stroke($img);
		}
	}

	//---------------
	// PRIVATE METHODS

	// Position the labels of each slice
	function StrokeLabels($label,$img,$a,$xp,$yp,$z) {
		$this->value->halign="left";
		$this->value->valign="top";

		// Position the axis title.
		// dx, dy is the offset from the top left corner of the bounding box that sorrounds the text
		// that intersects with the extension of the corresponding axis. The code looks a little
		// bit messy but this is really the only way of having a reasonable position of the
		// axis titles.
		$this->value->ApplyFont($img);
		$h=$img->GetTextHeight($label);
		// For numeric values the format of the display value
		// must be taken into account
		if( is_numeric($label) ) {
			if( $label >= 0 ) {
				$w=$img->GetTextWidth(sprintf($this->value->format,$label));
			}
			else {
				$w=$img->GetTextWidth(sprintf($this->value->negformat,$label));
			}
		}
		else {
			$w=$img->GetTextWidth($label);
		}

		while( $a > 2*M_PI ) {
			$a -= 2*M_PI;
		}

		if( $a>=7*M_PI/4 || $a <= M_PI/4 ) $dx=0;
		if( $a>=M_PI/4 && $a <= 3*M_PI/4 ) $dx=($a-M_PI/4)*2/M_PI;
		if( $a>=3*M_PI/4 && $a <= 5*M_PI/4 ) $dx=1;
		if( $a>=5*M_PI/4 && $a <= 7*M_PI/4 ) $dx=(1-($a-M_PI*5/4)*2/M_PI);

		if( $a>=7*M_PI/4 ) $dy=(($a-M_PI)-3*M_PI/4)*2/M_PI;
		if( $a<=M_PI/4 ) $dy=(1-$a*2/M_PI);
		if( $a>=M_PI/4 && $a <= 3*M_PI/4 ) $dy=1;
		if( $a>=3*M_PI/4 && $a <= 5*M_PI/4 ) $dy=(1-($a-3*M_PI/4)*2/M_PI);
		if( $a>=5*M_PI/4 && $a <= 7*M_PI/4 ) $dy=0;

		$x = round($xp-$dx*$w);
		$y = round($yp-$dy*$h);

		// Mark anchor point for debugging
		/*
		$img->SetColor('red');
		$img->Line($xp-10,$yp,$xp+10,$yp);
		$img->Line($xp,$yp-10,$xp,$yp+10);
		*/

		$oldmargin = $this->value->margin;
		$this->value->margin=0;
		$this->value->Stroke($img,$label,$x,$y);
		$this->value->margin=$oldmargin;

	}
} // Class

/* EOF */
?>
